在计算等效三相负荷时，如果只有相负荷，则等效三相负荷取最大相负荷的（）倍。
A.A
B.B
C.C
D.D
参考答案：C
找出错误并改正。
( ) 1. Here are some picture of our trip. ________________
A B C
( ) 2. I am in the train station. ________________
( ) 3. Danny is listening to Mr. Wood when I saw him. ________________
( ) 4. Jim likes go to the park. ________________
产品实现的策划应对新产品也适用；
